IEC 61280-2-1:2010 pdf free download

IEC 61280-2-1:2010 pdf free download Fibre optic communication subsystem test procedures – Part 2-1: Digital systems – Receiver sensitivity and overload measurement
The format (pulse shape, amplitude, etc.) of the test signal shall be compliant with that required at the transmit input interface. The receiver portion of the test equipment shall be able to interface with the system output for the measurement of digital errors.
3.2.2 Error counter The error counter of the BER test set shall be able to interface with the output of the EUT. It shall be capable counting single errors or errored blocks at the data rate of system output interface of the EUT. If the error counter has the facility for computing the BER or EBR value it must be capable of calculating a value as low as 1 0 –1 2 .
3.3 Optical power meter The optical power meter used shall have a resolution of at least 0,1 dB, shall be data format and bit rate independent and shall have been calibrated for the wavelength and power range of operation for the equipment to be tested. All measurements shall be recorded on the dB scale.
3.4 Variable optical attenuator The optical attenuator shall be capable of attenuation in steps less than or equal to 0,25 dB and should be able to provide a total attenuation that is at least 5 dB greater than the specified input range of the receiver under test. Care should be taken to avoid back reflection into the transmitter.
3.5 Optical splitter The optical splitter (coupler) shall have one input port and two output ports equipped with appropriate connectors. The splitting ratio for the output ports should be 50 % 0,1 dB (unless otherwise specified).
3.6 Test cords Single-mode or multimode fibre reference test cords and fitted with the appropriate connectors as required by the application shall be used, unless otherwise agreed. The optical loss of the test cords including connectors shall not exceed 1 ,0 dB.
3.7 Optical transmit interface The optical transmit interface shall have electrical and optical characteristics similar to those of transmitters that are used in the specified fibre optic terminal devices, except that the output power shall exceed the maximum specified input power of the receiver by at least 2 dB.
4 Equipment under test (EUT) The EUT shall be a fibre optic receiver, optical amplifier or optical regenerator, including all associated signal conditioning, processing and multiplexing equipment used in the system under normal operating conditions. The system input and output terminations shall be those normally seen by the user of the system.